Fermi gas
E57419
A Fermi gas is a quantum many-particle system composed of fermions that obey Fermi–Dirac statistics, often used to model electrons in metals, neutrons in neutron stars, and ultracold atomic gases.
All labels observed (2)
| Label | Occurrences |
|---|---|
| Fermi gas canonical | 1 |
| Fermi gas model | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T461683 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: Fermi gas Context triple: [Bose–Einstein condensate, isRelatedTo, Fermi gas]
-
A.
Fermi liquid theory
Fermi liquid theory is a framework in condensed matter physics that describes how interacting fermions in a metal behave like long-lived quasiparticles with properties similar to those of a non-interacting Fermi gas.
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B.
Fermi–Dirac statistics
Fermi–Dirac statistics is the quantum statistical framework that describes the distribution and behavior of indistinguishable fermions, such as electrons, which obey the Pauli exclusion principle.
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C.
Fermi energy
Fermi energy is the highest occupied energy level of a system of fermions at absolute zero temperature, playing a central role in determining the electronic and thermal properties of metals and semiconductors.
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D.
Fermi surface
The Fermi surface is the boundary in momentum space separating occupied from unoccupied electron states at zero temperature, crucial for determining a metal’s electronic and superconducting properties.
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E.
Bose–Einstein statistics
Bose–Einstein statistics is a quantum statistical framework that describes the distribution and collective behavior of indistinguishable bosons, underpinning phenomena such as Bose–Einstein condensation.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: Fermi gas Target entity description: A Fermi gas is a quantum many-particle system composed of fermions that obey Fermi–Dirac statistics, often used to model electrons in metals, neutrons in neutron stars, and ultracold atomic gases.
-
A.
Fermi liquid theory
Fermi liquid theory is a framework in condensed matter physics that describes how interacting fermions in a metal behave like long-lived quasiparticles with properties similar to those of a non-interacting Fermi gas.
-
B.
Fermi–Dirac statistics
Fermi–Dirac statistics is the quantum statistical framework that describes the distribution and behavior of indistinguishable fermions, such as electrons, which obey the Pauli exclusion principle.
-
C.
Fermi energy
Fermi energy is the highest occupied energy level of a system of fermions at absolute zero temperature, playing a central role in determining the electronic and thermal properties of metals and semiconductors.
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D.
Fermi surface
The Fermi surface is the boundary in momentum space separating occupied from unoccupied electron states at zero temperature, crucial for determining a metal’s electronic and superconducting properties.
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E.
Bose–Einstein statistics
Bose–Einstein statistics is a quantum statistical framework that describes the distribution and collective behavior of indistinguishable bosons, underpinning phenomena such as Bose–Einstein condensation.
- F. None of above. chosen
Statements (49)
| Predicate | Object |
|---|---|
| instanceOf |
ideal quantum gas
ⓘ
quantum many-body system ⓘ theoretical physics model ⓘ |
| applicableTo |
electrons in a metal conduction band
ⓘ
neutron matter in neutron stars (approximation) ⓘ nucleons in atomic nuclei (approximation) ⓘ trapped ultracold fermionic atoms ⓘ |
| assumes |
indistinguishable fermions
ⓘ
occupation numbers 0 or 1 per state ⓘ |
| characterizedBy |
Fermi energy
ⓘ
Fermi momentum ⓘ Fermi temperature ⓘ |
| composedOf | fermions ⓘ |
| contrastedWith |
Bose gas
ⓘ
surface form:
Bose–Einstein gas
|
| describedIn | statistical mechanics ⓘ |
| equationOfStateDependsOn |
particle density
ⓘ
spin degeneracy ⓘ temperature ⓘ |
| hasDistributionFunction |
Fermi–Dirac statistics
ⓘ
surface form:
Fermi–Dirac distribution
|
| hasProperty |
at most one fermion per single-particle quantum state
ⓘ
particles obey Pauli exclusion principle ⓘ pressure persists at zero temperature ⓘ quantum degeneracy at low temperature ⓘ supports Fermi pressure ⓘ |
| hasVariant |
degenerate Fermi gas
ⓘ
ideal Fermi gas ⓘ interacting Fermi gas ⓘ non-interacting Fermi gas ⓘ relativistic Fermi gas ⓘ spin-polarized Fermi gas ⓘ |
| limitCase | classical ideal gas at high temperature and low density ⓘ |
| namedAfter | Enrico Fermi ⓘ |
| obeys | Fermi–Dirac statistics ⓘ |
| relatedToConcept |
Bose gas
ⓘ
Fermi liquid ⓘ Fermi surface ⓘ Pauli exclusion principle ⓘ degeneracy pressure ⓘ quantum degeneracy ⓘ |
| temperatureRegime | quantum effects dominate below Fermi temperature ⓘ |
| usedIn |
astrophysics
ⓘ
cold atom physics ⓘ condensed matter physics ⓘ nuclear physics ⓘ |
| usedToExplain |
electronic heat capacity of metals
ⓘ
stability of white dwarfs and neutron stars via degeneracy pressure ⓘ |
| usedToModel |
electrons in metals
ⓘ
neutrons in neutron stars ⓘ ultracold atomic gases ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: Fermi gas Description of subject: A Fermi gas is a quantum many-particle system composed of fermions that obey Fermi–Dirac statistics, often used to model electrons in metals, neutrons in neutron stars, and ultracold atomic gases.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
Fermi gas model